Elevator-controlling system.



F. C. FURLOW. ELEVATOR CONTROLHNG SYSTEM.

APPLICATION men nov. 5. 1915.

1,268,109 Patented June 4. 1918.

6 SHEETS-SHEET @ATZA INVENTOR A TTORNEY WITNESSES:

F. C. FURLOW.

ELEVATOR CONTROLLING SYSTEM.

APPLICATION FILED NOV. 5. 1915.

1,268, 1 O9. Patented June 4. 191&

6 SHEETS-SHEET 2.

WITNESSES: VENTOR 4 TTORNE) F. C. FURLOW.

ELEVATOR cormzoume SYSTEM.

APPLICATION FILED NOV- 5. 1915. 1,268, 109. Patented June 4. 1918.

a SHEETS-SHEET 3..

@Mf $14. W L 87 A TTORNEY F. c. FURLOW.

ELEV/non coumoumc svsnm. ARPLICATION FILED NOV. 5. I915.

1,268, 109. Patented June 4. mm

6 SHEETS-SHEET 4- INVENTOR WI l/VESSES.

M e z A T DRNE Y F. C. FURLOW.

ELEVATOR CONTROLLING SYSTEM.

APPLICATION FILED NOV. s. 1915.

1 ,268, 1 09. Patented June 4, 1918.

6 SHEETS-SHEET 5.

WITNESSES: bl INVENTOI? Z 1 A TTORNEY F. C. FURLOW.

ELEVATOR CONTROLLING SYSTEM.

APPLICATION HLED NOV. 5. 1915- Patented June 6 SHEETSSHEET 6.

WITNESSES: INVENTOR flwzw. 2 zzcz flamdfl O a j/g g.

AITORNEY UNITED STATES PATENT OFFICE. FLOYD C. FURLOW, OF MONTGLAIB,NEFZFERSEY, ASSIGNOR TO OTIS ELEVATOR COM- PANY, OF JERSEY CITY, NEWJERSEY, A CORPORATION OF NEW JERSEY.

ELEVATOR-CONTROLLING SYSTEM.

Specification of Letters Patent.

Patented June 4, 1918.

To all whom it may concern:

Be it known that I, FLOYD C. FURLow, a citizen of the United States,residing in Montclair, in the county of Essex and State of New Jersey,have invented anew and useful Improvement in Elevator-ControllingSystems, of which the following is a specification.

My invention relates to elevators, and more particularly to an improvedsystem of control therefor, the same having a general application to allthe various types of elevators, but being illustrated herein inconjunction with a hydraulic elevator, controllable by an automatic pushbutton system of circuits.

The more essential features of the invention, reside in the provision ofmeans for automatically controlling the operation of the elevator car instopping, so as to bring the ear exactly level with the floor landing,the means so used in accomplishing this result, being operableindependently of the car speed and load; another feature resides in theprovision of means for overcoming the objectionable crawl or settling of,the car away from the floor level.

In the control of elevators, a certain defeet has long existed, whichhas been the cause of serious accidents, inconvenience and expense, aswell as delay in the elevator service or schedule. This defect is theinability automatically to control the elevator car in stopping, so asto bring the car floor at an exact level with the landing, this beingmore particularly so, in the case of an automatic push button controlledelevator, in which system, a well known form of floor controlling deviceis employed, in stopping the car. The present day floor controllingdevice proves inadequate for the reason that it can only be set. once,for a given speed, and for an approximated load. Thus it will be evidentthat the floor controller will, for any load or speed above or below theapproximated, tend to stop the car some distance either above or below adesired floor landing.

I propose to overcome these defects in a simple and most practicalmanner, by using what I will term an improved automatic car levelingsystem, the same being operable independently of the car speed or load,and more essentially by means which bear a certain fixed relation to theelevator car when at a landing.

Referring now to the drawings, Figure 1 illustrates in generalarrangement, a typical hydraulic elevator system, together with improvedcontrolling apparatus therefor, arranged in accordance with the presentinvention; Fig. 3 illustrates with certain parts in section, an enlargedview of certain parts illustrated in Fig. 1, these parts comprising amain valve together with a main and auxiliary controlling apparatustherefor; Fig. 2 illustrates diagrammatically, a typical push buttonelectrical control system, as applied to Fig. 1; Figs. 4, 5, 6 and 7illustrate more in detail and in different views, certain of the partsillustrated in Fig. 3, and Figs. 8, 9, 10, 11, 12, illustrate differentviews somewhat enlarged, of the details of construction of certain ofthe switch apparatus, illustrated in Fig. 1.

Referring now more particularly to Fi 1, I will first designate theparts in general, and thereafter describe certain. of the parts indetail.

An elevator car C, counterweight WV, plunger 1, plunger cylinder P, mainvalve V, and a hand rope A, operating the valve sheave B, are well knownparts having well known functions. I

A supply or pressure pipe 1, and a discharge pipe 2, connect theapparatus with a source of water under pressure for supply and anysuitable receptacle for exhaust ot' the fluid.

The main valve V consists more essentially of a piston 3 (see Fig. 3)connected through a rack and pinion connection 4 to a valve shaft 5, atone end of which is keyed the sheave B, adapted for operation from theelevator car by means of the hand rope A; the valve piston 3 is operatedeither upwardly or downwardly from itsnormal po-= sition (as shown inFig. 3) depending on the direction of rotation of the sheave B, theupward movement thereof causing the car to descend, by connecting theplunger cylinder with the discharge pipe 1, and the downward movementthereof, causing the car to ascend, by connecting the supply or pressurepipe 1 with the plunger cylinder.

in the present instance. the hand rope operation is intended foremergency only. it being pin-posed to ordinarily control the main valveby means of a 31112111 electric inotor designated M, the motor in turnbeing controlled by a well known push button system of electricalcircuits, such as illustrated in Fig. 2. The motor M is connected to thevalve shaft 5, through a comparatively high speed reduction mechanism asby means of the sprocket and chain connection 6, and a manually operableclutch mechanism 7, the larger sprocket wheel being loose on the shaft 5and being rotatable therewith with the clutch in the position asindicated in Fig. '1. The electric motor M is reversible and is adaptedto actuate the main valve, in either direction from its normal position,there being provided for the purpose of antomaticall y centering thevalve, a valve ccntering device, designated I). This device comprises apair of sheaves 8, having a force fit on the hub of the large sprocketwheel. it cable 9 forms a loop around a weighted sheave 10, oppositeends of the cable passing around opposite faces of the sheaves 8, theends being connected to the sheaves. Stops 11, normally l air on tllctop 1:2 of a casing 13, containing the weighted sheave '10. \Vith thisarrangement the weighted sheave 10 will. act automatically to center thevalve, from either of the two actuated positions given thereto byrotation of the sprocket wheel in one direction or the other.

In addition to the motor and hand rope control of the car, there isprovided in addi tion thereto, what may be termed, a master car levelingdevice, designated l5. which is for the purpose of autormtticallycontrolling the car to effect an exact landing. This device comprisestwo auxiliary by pass valves V, V each valve being operableindependently by means of OlCCt'I'OIHtIgiIQtS G, ti, respectively. Theelectrically operated valve V operates to by pass pressure from thecylinder l by way of a pipe 14-, valve Y. and pipe 16 to discharge pipe'lhe electrically operated valve V operates to by pass pressure to thecylinder P, by way of a pipe 17, valve V pipes 15 and 14, and thence tothe cylinder P. lt will thus far be seen, that the by pass valves V andV control the car respectively to descend or as cend.

llcl'erring now more particularly to Fig. 2, the elen'ients will firstbe designated, they comprising a suitable source of current supplydesignated and main line switch .13; an electromagnctic main line switch19; reversingswitches it, It. controlling two sets of back contacts 20,R-l and 21, S3 respect ivcly. the electric motor lit having a seriesfield winding lit: lloor controller switches '22, 23. 2-1 and 25; lioorrelay magnets each controlling a pair of normally open contacts 27; auoninterfi-rencemagnet :Zihaving opposed windings. this magnet,controlling contacts J9: an rdditional relay magnet ill) controllingcontacts 31; hall push buttons one at each floor landing, designated 32;car push buttons, one for each floor, designated 88, 33 and 5-33additional car push buttons 3st, 35; an electromagnet 3G, controlling acam 36 on the elevator car, this electrically op erated cam controllinga door lock mechanism 37, for each hall door designated 38; doorcontacts 35); car door contact 40; safety ca r switch ell; limitswitches 42; electromagnets G, G controlling the auxiliary valves, relaymagnets, -13, 4:3, controlling contacts 4%, dot, the latter contactscontrolling circuits for the auxiliary alve operating magnets G and ti,respectively; two sets of contacts actuated by switches 45, 45, mountedin the car, these-switches controlling circuits for the relays i8, 43';a series field resistance to, controlled by an electromagnet- 47, theelectromagnet in turn being controlled by means of a cam operated switch48, the cam 45) operating said switch, being rotatable with the valveshaft as seen in Figs. 1 and The floor controller according to thepresent invention comprises a number of switches constructed as shown inFigs. 10, 11 and 12. These switches are positioned in the elevatorhatchway, there being one switch only, at the top and bottom floors, andtwo switches at each intermediate tloor. These \\itCll6S perform thesame function as does the well known type, Carichofi floor controller,illustrated in Patent No. 783.174. 'ranted February 219 1905.

These switches are all of similar construction. each comprising a member50, pivoted at :31, on an adjustable base or support 52. Fixed to thisbase or support is a casing containing a pair of fixed contact fingers53. A contact blade 5-1 is controlled by the member 50, to llltlliO andbreak with the fixed contacts 53. The member 50 is provided with twooppositely extending arms such as these arms being adapted to actuatethe blade 54, through co-action with a roller 56, fixed on the elevatorcar. The switches 23 and 25 control the car in ascending, it being notedthat as the car ascends, the contacts 53 are positioned relatively withthe blade, so as to be open circuited, the car in descending causingthese contacts to be close circuited. The switches 22 and 24: controlthe car in descending. the contacts associated with these switches,hearing such relation with the blade Set, as to be open circuited by thedescending car, but close circuited by the ascending car. It

will be pointed out here, that these switches are set. at each floor,and relatively with their respective landings. so as to cll ect an exactlanding at any desired floor, tor a given car s 'ieethandapproximatedload. llowever, as pointed out before, the. car speed aswell as load are subject to a wide range of variations, which will tendto make the elevator car, either ever run or under run a desired landingbefore a final stop; now in order to overcome this difiiculty, there isprovided in order automatically to bring the elevator exactly with thefioor landing, aside from the electrically operated valves, V, V therelays 43, 43' and switches 45, 45 two sets of cams 61, 62, these camsbeing positioned in the elevator hatchway, the lowermost cams ateachfloor forming the set 51, and all being in the same vertical plane, andthe upper cams at each floor forming the set 52, this set of cams beingall in the same vertical plane, which is otfset from that or" the set51. The two cams at each floor bear a. certain relation to each other,as well as with the floor controlling switches at their respectivefloors, the reasons for this being pointed out more fully hereinafter.The cams forming the set 61, are adapted to actuate the switch 45mounted on the elevator car, the set 62, being adapted to actuate theswitch 45. These switch devices are illustrated in detail in Figs. 8 and9, the two switches being of similar construction, and being containedin a casing 57, the casing being fixed by an adjustable connection 58,to the top of the elevator car. A contact 86 is yieldingly connected toa suitable insulated base A coacting contact 86 is carried by a gravityactuated arm (30, the arm being pivoted at 61. The arm carries a roller85, this roller being associated with the switch 45 and adapted to coactwith the cams forming the set 61. The roller 85 is associated with theswitch 45, it being adapted to coact with the cams forming the set Thufar it will be pointed out, that the elements constituting the automaticcar leveling device comprise, the electrically operated by pass valvesV, V the relay magnets 43, 43 which control circuits for the valveoperating magnets Ur, Ur respectively, the relays being controlled bythe switches 45, 43' on the elevator car, and these switches in turnbeing controlled by the two sets of cams til, 62 in the elevatorhatchway. An auxiliary knife switch 18, may be provided if desired (seeFig, 1) to connect or disconnect the automatic electrieal car levelingapparatus from the source of current supply.

Having thus pointed out in detail the various elements constituting thepresent improved controlling system, I will now describe the operationof the various parts through a complete cycle of operation. We willassume that th elevator car is heavily loaded at the third floor asindicated in Fig. 1, it being desired to descend to the second floor.For this operation the car button 33' i pressed. A circuit is therebyestablished as follows: from the main, wire 63, door contact 40,. switch41, wire 6*, wire 65, through one of the windings of non-interferencemagnet, wire 66, relay 30, wire 67 common to the car push buttons, pushbutton 33 to wires 68, 69, floor relay magnet 26, Wire 73, floor switch24, which is now closed, Wire 70, through down reversing switch windingR, wire 71, back contacts 21, Wire 72, hatchway limit switches 5L2, andthence by wire 78 to line. A parallel circuit for the winding of themainline switch 19 may be traced from the junction 63, hatchway doorcontacts 39, wire 75, to winding of main line switch 19, and thence byWay of wire 76 and auxiliary contacts 76, on the reversing switch Rwhich is now closed, to the minus line. A parallel circuit for thewinding of the cam magnet may be traced from the branch 64, wire 77, cammagnet 36, wires 78 and 76, to line by way of auxiliary contacts 76. Thecam magnet receiving current will now actuate the cam out of engagementwith the door locking mechanism which will now operate to lock the door.The winding 19 now receiving current will close the main line switch andthereby connect the motor to the source of current supply, and since thereversing switch is closed, the motor M will now operate, to move themain valve, upwardly, thus connecting the plunger cylin der with theexhaust pipe 2, and permitting the' elevator car to descend. The mainvalve is maintained in its operated position by the power exerted by themotor M, against the action of the weighted sheave 10. Upon the valvebeing operated to full open position, the cam as has at this time beenrotated sufliciently to allow the switch 4:8 to close, thereby effectingan operation of the electromagnet 4L7, to insert a resistance 46 inseries with the field winding M, thus protecting against overheating themotor M. The non-interference magnet 28 operates in a usual manner toopen its contacts 29, thus open-circuiting the wire 79, which is acommon feed wire for the hall push buttons 32. The relay 30 closes itscontacts 31 and establishes a holding circuit, which circuit is the oneheretofore traced up to and through the relay 30, contacts 31, wire 80to line. As this latter holding circuit can normally be opened only atcar door contacts 40, or the safety switch 11, the control of the car byoperation of any of the floor landing switches is prevented until thecar has stopped and car door opened to restore the magnets 28 and 30 andthe door again closed. Furthermore since the hatehway door eontacts areincluded in series with the winding of the main line switch 19,operation of the said switch and consequently the elevator car, isprevented, until all of the hatch- Way doors are closed. When the carpush ill iitl

, with button \33' is released, the circuit for the windings of thereversing switch, non-interference magnet, etc., is then maintained byway of the branch wire .81, auxiliary contacts 81, through the relaycontacts 26", and so on to the line, by way of the floor controllerswitch 24:. It will be mentioned here, that the push-button system ofelectrical circuits illustrated herein for controlling the valveoperating electric'motor M is well known.

The car now descending, will, upon reaching the 2nd floorianding, bringthe roller 55 carried thereon into engagement with the floor controllerswitch 25%, thereby openingits associated contacts, which open thecircuits for the windings of the reversing switch, etc. The reversingswitch will now open, thereby cutting ofl the current supply to theelectric motor M, and permitting the main valve to be centered by meansof the valve centering device D. The main valve as is well known will becentered in a certain time period irrespective of the speed and load, ofthe car, and consequently with a heavily loaded descending car, thetendency will be for the elevator car to travel some slight distancebelow the second floor level, before the final stop corresponding to thecenter position of the main valve is effected.

Here is where my improved master car leveling device is brought intoaction, automatically to bring the elevator car eitactly to the floorlanding, it being particularly noted that the elements accomplishingthis result operate independently of the car speed or load. So soon asthe car floor tends to travel below the second floor landing, the switchis closed through the engagement of its roller 85' with the cam 61. Theclosing of the switch -l5 closes a circuit for the relay magnet 43,whose contacts a l" in turn establish a circuit for the electromagnet G,the latter now actuating the valve V to by-pass pressure into theplungercyh inder P by way of pipes 17, valve V and thence by way ofpipes 15 and 14: to the cylinder P. The pressure now admitted to thecylinder l will cause the car to ascend at an approximated slow speed,and directly as the car floor comes flush with the iioor landing, theroller 62 rides off the cam 61, thus allowing the switch 45" to open.The electromagnet G is in this manner deenergized, permitting the valveV to return to its normal position. in this way the pressure supply iscut of? from the cylinder l? thus causing the elevator car to stop thevery instant the car floor is exactly levej with the floor landing.

it is a well known fact, that in a hydraulic elevator system there isalways more o less leakage around the valves, or plunin fact both. Thisleakage is ohjeo since permits t" gradually to crawl or settle below thefloor landing. Now it will be seen that with the present invention sosoon as the car starts to settle, it will be automatically returned.exactly level with the floor landing, throu h the action of theautomatic car leveling evice as described above.

In operating the elevator car in an ascending direction by means ofeither the car or hall push buttons, the main parts op erate in asimilar manner as for the'descending car operation, with the exceptionof the electric motor M, which for an ascending direction of car travel,is controlled by the reversing switch R, to operate in a reversedirection to that heretofore described, thus effecting a movement of themain valve in a reverse direction, which in this instance would bedownwardly, thereby connecting the plunger cylinder P with the pressuresupply. Pressure now being admitted to the plunger cylinder, causes thecar to ascend to the desired floor, whereat the opening of the floorcontrolling switch by the roller causes the car to be brought to a stop.Take now for example the case of the car ascending from the 1st to the2nd floor, with a light load, The tendency in this instance is tor theelevator car to coast past the second floor landing. in this instancethe upper cam 32, at the second floor coacts with the roller 85, therebyclosing the switch 45, the cam 62 being positioned so as to ac tuatethis switch directly as the car floor rides above the floor landing. Theswitch 45 closes a circuit for the relay 43, whose contacts er establisha circuit for the electromaghet G, the latter actuating the valve V tobypass pressure from the cylinder P, by way of pipes l4, 15, valve V,and thence by way of pipe 16 to the exhaust pipe 2. Water pressure nowbeing relieved from the cylinder, causes the car to descend, at anapproximated slow speed, until the car floor is exactly level with thelanding, at which instant the roller 85 rides off the cam 62 thusallowing the switch 45 to open. ()pen ing the switch 45 causes thede'e'nergization of the magnet G, which permits the valve V to close andthus cut ed the escape of a tluid pressure. in this manner the ascendingelevator car is brought automatically at an exact level with the iloorlanding, in case the car tends to travel or coast past the desiredlanding. that the common return wire 82 for the electromagnets G, G iscontained in series with the auxiliary bar-k contacts 83, on thereversing switches R and R respectively, hence, so long as either one ofthese switches is closed or operated, it is impossible to effect anoperation of either of said electromagnets.

Aside rroin the automatic control system Tt will here be pointed out Uprovided for controlling these elementsfa manual control comprising twopush but' tons in the elevator car, the buttons for this I uttonscontrol the operation of the valve magnets G, G in the same manner as dothe switches 45, 45 on the car. The button 34 controls the operation ofthe ma net G, it being connected in parallel with the switch 45, and thebutton 35 controls the operation of the up ma et G, it being connec tedin parallel wlth the switch 45. These two uttons, primarily, are used toeffect what is commonly termed an inching operation.

In case the motor M or its associated electrical controlling apparatusshould get out of order, the motor and its connected sprocket wheel,etc., may be disconnected from the valve shaft 5, by actuating theclutch mechanism 7; The main valve then may for the ordinary operationbe controlled bya car lever operative through the medium of the handrope A. l

Now it .ill be evident that with the use of the present master carleveling device, together with the particular arrangement of theapparatus controlling the same, permits of the most fine adjustment ofparts,

80 to bring the car to a stop exactly at the desired floor level.Furthermore it is an inherent feature in the present master car lev--eling device to overcome the objectionable crawl or settling of the cardue to leakage,

85 etc., it being seen that the device becomes operative in the event ofthe car overrunnlng or underrunnin the desired landlng, either in itsascent or escent, or in the event of settling, after once being broughtexactly level with the floor landing.

i The invention in its fundamentals may have a' wide range ofapplications, to either electrically or mechanicall controlled ele-'vators, employing any wel know'n motive means', 'such as, steam,electricity or bydraulic pressure.

Havin thus described my invention, what I c aim is new and desire tosecure by Letters Patent of the United States is:

$0 1. In an elevator, the combination of the car, a hydraulichoisting-motor therefor, mechanism to control the motor to raise andlower the car, means independent of the car to actuate the saidmechanism, and means controlled automatically by the car, to control thesaid actuating means to cause the latter to actuate the said mechanismto control the hoisting motor to raise and lower the car.

'0 2. In an elevator, the combination of the car, a hydraulic hoistingmotor' therefor, mechanism to control the motor to raise and lower thecar, electro-responsive means to actuate the said mechanism, andmechanism 66 controlled automatically by the car, to con- Burpose beingdesignated 34 and 35. These trol the electro-responsive means to causethe latter to actuate the said mechanism to control the hoisting motorto raise or lower the car.

3. In an elevator, the combination of the 10 car, a hydraulic hoistingmotor therefor, a main valve and an auxiliary valve to control themotor, means to operate the main valve,

means to open the auxiliary valve to cause the motor to move the car toa level with the desired landing, comprising an electro-magnet, anelectric circuit therefor, including a switch, means toclose the switchautomati' cally by the movement of the car to the desired landing.

4'. In an elevator, the combination of a car, a hydraulic hoisting motortherefor, a main valve andan auxiliary valve to control the motor, meansto operate the main valve, means to open the auxiliary valve, to causethe motor to move the car to a level with the desired landing,independently of the main valve, comprising an electro-magnet, anelectriccircuit therefor, including a switch, a cam in the hatchway toengage the switch and close it upon the movement of the car to thelanding to cause the electro-ma et to open the auxiliary valve, and upont e car floor becomin level with the landing to release the switc toopen the circuit to deenergize the magnet to allow the auxiliary valveto close.

5. In an elevator, the combination of the car, a hydraulic motortherefor, a main valve to control the motor, means to operate the valve,two auxiliary valves also to control the motor, one auxiliary valve tocontrol the car in its ascent and the other auxiliary valve to controlthe car in its descent to cause the motor to raise or lower the carfloor to a level with the floor landing, means to open the auxiliaryvalves, comprising electroma nets and electric circuits therefor, incluin switches in the circuits, and cams to close t e switches by themovement of the 1 car to a desired floor landing to open the auxiliaryvalves, whereby the car floor is brought to a level with the landingdoor.

6. In an elevator, the combination of a' car, a hydraulic hoisting motortherefor, a

main valve and an auxi ary valve for controlling the motor, means tooperate the main valve, means to open the auxiliary valve, to move thecar to a level with the floor landing independently of the main 12valve, comprising an electro-magnet, an electric circuit for the magnet,a switch on the car in the circuit, a cam in the hatchway to engage andclose the switch upon the movement of the car to the desired floorlanding, and to release the switch and allow it to open to allow theauxiliary valve to close, u OIL the car floor being level with the lanmg floor.

7. In a hydraulic elevator, the combina- 18o tion of a car, a hydraulichoisting motor therefor, a main controlling valve for the motor, a pushbutton electrically op erable apparatus including an electric circuittherefor, to control the main valve to operate the car, an auxiliaryvalve further to control the motor, independently of the main valve, tobring the car to a level with the desired floor landing, meanselectrically operable to open the auxiliary valve, and an electriccircuit therefor, the said circuit being interrelated with thepush-button apparatus and so controlled thereby as to prevent it beingclosed if and when the first named circuit is closed 8. In a hydraulicelevator, the combination of a car, a hydraulic hoisting motor therefor,a main controlling valve for the motor, a push buttoncontrollerapparatus, operable to open the main valve, and means to close the mainvalve, an auxiliary valve for further controlling the motor,independently of the main valve, to bring the car to a level with thefloor of, a desired landing,

electrically. operable means including a switch to control the auxiliaryvalve to open it, and means automatically operable upon the movement ofthe car to close the said switch to control the auxiliary valve, to openthe same to cause the motor to operate the car to have its floor becomelevel with the landing floor.

9. In a hydraulic elevator, the combination of a car, a hydraulicmotorto operate the car, a main valve to control the motor, an electric motorto open the main valve, a push button apparatus for controlling theelectric motor, an electric circuit to the electric motor, a switch inthe circuit, means to engage the switch and open it upon the movement ofthe car to a desired floor, to allow the main valve to be.olosed, anauxiliary valve for further controlling the motor to bring the car floorto a level with the floor of the landing floor, another electric means,including an electric circuit and a switch therein, and means to closethe last.

mentioned switch by the movement of the car to the desired landing, toopen the auxiliary valve. I

10. In an elevator, the combination of the car, a hydraulic hoistingmotor therefor, a main valve and an auxiliary valve mechanism to controlthe motor, means to'control the operation ofthe main valve, electro-responsive means to actuate the auxilia valve mechanism, aswitch, meansautomatlcally to close the switch by movement of the car to a desiredlanding, and an electrical circuit for the said electro-responsivemeans,

controlled by the main valve controlling means and the said switch.

11. In a hydraulic elevator, a car; a hydraulic hoisting motor therefor,a mam valve to control the motor, an electric motor to open the mainvalve, aswitch controlling a circuit for the electric motor, auxiliarycontrolling mechanism further to control the hydraulic motor to bringthe car floor to a level with the floor of a desired landing, electricmeans to actuate the-auxiliary mechanism, and means controlled bymovement of the car to control a circuit for the said electric means,said circuit being also controlled by the [above-named switch.

12. In an elevator, the combination of the car,a hydraulic'hoistingmotor, a main valve,

means controllable from the car to control the main valve, auxiliaryvalve mechanism to control the hydraulic motor to move the car to alevel withv a desired landing, electroresponsive means to actuate theauxiliary valve mechanism, a switch controlled by movement of the car,and a circuit for the electro-responsive means, controlled by the firstnamed controlling means and the said switch.

13. In an elevator, the combination of the car, a hydraulic hoistingmotor therefor, a valve mechanism to control the motor to raise andlower the car, electro-responsive means to actuate the valve mechanism,switches to control electrical circuits for the electro-responsivemeans, and means to close one of the switches automatically by movementof the car to a desired landing, and to open said switch when the carplatform is level with the'said landing, and means to close the other ofsaid switches automatically by movement of the car platform inoverrunning the said landing, said switch closing a c1rcuit=to theelectro-responsive means to effect operation of the valve mechanism tocontrol the hydraulic motor to reverse the movement of the car andreturn its platform to a level with the said desired landing.

l4. Ina hydraulic elevator, a car, a hydraulic hoisting motor therefor,a main valve to control the motor, an electric motor to open the valve,acircuit to the electric motor, a switch in the circuit, front and backcontacts on the switch, the front contacts forming a part of the saidcircuit an auxiliary valve further to control the .ydraulic motor tobring the car floor to a level with the floor of the desired landing,electric means operable to open the auxiliary valve, an electric circuitfor the said electric means, including the said back contacts, and meansto close and open the said circuit by the movement of the car to adesired landing.

15. In an elevator, the combination of the car, a hydraulic hoistingmotor therefor, a main valve, manually operable means to control theoperation of the main valve, an auxiliary valve mechanism to control themotor to raise and lower the car independently of the main valve, andmeans controlled manthe car.

16. In an elevator, the combination of the car, a hydraulic hoistingmotor, a main valve, means controllable from the car to contl'ol themain valve, auxiliary valve mechanism to control the motor,BlGCtI'O-IGSPOIlSlVQ means to actuate the auxiliary valve mechanism tocontrol the motor to raise and lower the car independentl of the mainvalve, and manually operab e circuit controller in the car, and acircuit for the electro-responsive means controlled by thefirst namedcontrolling means and the said manually operable circuit controller.

17. In an elevator, the combination with the car, motive means for thecar, push button controlled apparatus to control the motivc means andmeans under the control of the said push button controlled apparatus tolevel the car with the landing, independently of the said'ap aratus.

18. In an e evator, the combination with the car, motive means for thecar, ush button controlled apparatus to contro the motive meansindependently of its speed, and means under the control of the said ushbutton controlled apparatus automatical y to raise or lower the car andlevel the same with the landing.

19. In a hydraulic elevator, the combination of the car, a hydraulicmotor, a main valve, a motor for actuating the valve, an automatic pushbutton system of electrical circuits and a floor controller apparatuscomprising a switch at each floor operable by the car to control themotor, an electrically controlled by-pass valve, and means comprising acoacting cam and switch dependent on the 40 car overrunning orunderrunning the desired landing, automatically to control theby-passing means to effect an exact car landmg.

20. In an elevator, the combination with 5 the car, push-buttoncontrolled ap aratus to control the car, and means under t e control ofthe push button controlled ap aratus automatically to level the car witht e landing, independently of the first named apparatus.

21. In an elevator, the combination with the car, push-button apparatusto control the car, and auxiliary means controlled b the said pushbutton apparatus automati y to raise or lower the car.

. FLOYD O. FURLOW. Witnesses:

Jessa H. VAN Au'r'nu,

T. M. Bamwm.

